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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Weighted Average Shares Outstanding (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]      
Weighted average number of shares outstanding – basic 32,791 33,704 33,198
Effect of dilutive securities:      
Stock options 502 281 162
Non-vested stock and stock units 316 319 381
Weighted average number of shares outstanding – diluted 33,609 34,304 33,741
Anti-dilutive securities 50 271 221